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This paper shows the losses created during alfalfa mowing process performed by oscillatory mower with classic cutting apparatus. The losses detected during research process have been divided into two groups: losses caused by increased incision height (over 6 cm), and losses caused by crushing. The total losses made during mowing by the tested mower were calculated by adding the incision height losses and crushing losses. The research results indicate that the minimal losses caused by the incision height are 0.57 % of yields, at the aggregate mowing speed of 3.82 km/h. Aggregate mowing speed increase tend to slightly increase the losses up to maximum values of 1.17 % at the mowing speed of 8.17 km/h. The crunching losses ranged from minimal 0.31 % at the minimal aggregate mowing speed. The average total losses were 1.18 % of yields at the average aggregate mowing speed of 5.76 km/h.

The quality of combine harvester work in the rye harvest is reflected in terms of the amount of realized losses and quality of harvested grain weight. The quality of combine harvester work depends on several factors: the condition of the crop, defining the relevant parameters for combines, technical correctness and staff skills. Quality of work is significantly decrease when key parameters are not well coordinated, resulting in increased losses of rye grain and a high proportion of impurities in harvested mass in the harvester bunker. The aim was to determine the effects of combines ZMAJ 135B and ZMAJ 143 in the rye harvest in the observed area. Work method determines the loss on the header and harvesting device depending on the changes: peripheral winches speed; combine speed, underdrum-drum distance at the entrance and evaluating the quality of harvested weight (content of whole, broken, poorly grains and other particles). Header losses were determined using a wire frame of 1m², located after the passage of the side behind the combine header and harvesting device by setting the appropriate container, during harvester motion, between front and rear wheels at an angle of 10- 20° in regard to the movement direction. The quality of harvested mass was determined by taking samples from the harvester bunker and the determination of the percentage content of healthy (whole), broken grains and impurities was performed later in the laboratory. The applied methodology is standard for this issue and is related to field-testing laboratory and exploitation wheat combine in the single-phase rye grain harvesting. The obtained results allow to point out the advantages and disadvantages of the applied concepts of different wheat combine. Header largest losses were registered in the device combines ZMAJ 143 and were 25.77 kg ha-1 (1.18%) and lowest in combine ZMAJ 135B, amounting to 14.76 kg ha (0.65%-1). The highest content of whole rye grain was in combine ZMAJ 135B and amounted to 97.34 in 1500, and the lowest in combine ZMAJ 132 94.59%. Based on these results it was concluded that the ZMAJ 135B harvester worked better than the harvester ZMAJ 143, with lower losses of rye grain on the harvester unit header, and higher content of whole grain with a significantly lower share of impurities in relation to other investigated harvester. The general conclusion of our research is that harvester ZMAJ 135B can be successfully used in rye harvest in a given area and with proper optimization of labor exploitation and operator training can gain full expression. [ABSTRACT FROM AUTHOR]